Finally, [1]} divided a sample of groups from the Galaxy And Mass Assembly (GAMA) survey into relaxed and unrelaxed, using \(\Delta m_{12}\)  and the luminosity offset as the relaxation indicators. They found that BCGs in unrelaxed systems are bluer, more star forming, and with non-elliptical morphologies than those in relaxed systems. They conclude that the higher rate of recent mergers expected in unrelaxed groups could be responsible for these differences. A similar result was also found in [2]}. These authors claimed that there are few star-forming galaxies in FGs, making them more mature then coeval and similar mass groups.
